Test sequence
WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Connect VAG1551 or VAG1552 scan tool, see VAG1551 SCAN TOOL (ST), CONNECTING .
- Switch ignition on.
- Press buttons -0- and -1- to insert the "Engine Electronics" address word 01.
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press - Q- button to confirm input.
Indicated on display
- Press buttons -0-, -0- and -6- to input display group no. 6 (006), and press -Q- button to confirm input.
- Check value in display field 2.
Specification: 0 0 0
- Depress clutch pedal.
Specification: 1 0 0 (left display element must change to 1)
If left display element does not change:
- Press --> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Switch ignition off.
- Disconnect harness connector from clutch vacuum vent valve switch, see DIESEL DIRECT FUEL INJECTION (DFI) SYSTEM COMPONENTS, OVERVIEW .
- Measure resistance across switch terminals.
Specifications:
- Clutch pedal not depressed: max. 10 ohms (ohm)
- Clutch pedal depressed: INFINITY ohm (no continuity)
If resistance is not as specified:
- Replace clutch vacuum vent valve switch -F36-.
- Display readiness code, see READINESS CODE, DISPLAYING .
If DTC memory was erased:
- Create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .
If resistance values are OK:
- Connect VAG1598/18 test box to Diesel DFI ECM connector.
- Check wiring for short circuit between connector terminals.
Specification: INFINITY ohm (no continuity)
If wiring is OK:
- Replace Diesel DFI ECM -J248-, see item 3 .
- Display readiness code, see READINESS CODE, DISPLAYING .
If DTC memory was erased:
- Create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .